GSO 6" F/4 M-R&P 153/612 Carbon Imaging with R&P focuser compatible with ZWO EAF (GSO, SKU: GSN550C / GS550C) is a compact imaging Newtonian reflector featuring a parabolic 6" primary mirror and a fast F/4 focal ratio. The full carbon fiber optical tube provides good mechanical rigidity and helps minimize focus shift caused by temperature changes. The telescope is equipped with a Rack&Pinion focuser with microfocuser, designed for use with the ZWO EAF electronic focuser. The secondary mirror spider is a monolithic CNC-machined design, which helps maintain collimation stability when the tube orientation changes.

Technical specifications

• manufacturer: GSO
• SKU: GSN550C / GS550C
• optical design: Newtonian reflector (parabolic)
• primary mirror diameter: 6" / 153 mm
• focal length: 612 mm
• focal ratio: F/4
• mirror figure: rotational paraboloid
• secondary mirror: 90 x 64 mm
• mirror reflectivity: 94%
• focuser: 2" Rack&Pinion with microfocuser, compatible with ZWO EAF
• focuser thread: M54x0,75
• optical tube: full carbon fiber tube with internal baffles
• secondary mirror spider: monolithic CNC construction
• plastic rear tube mask to reduce stray light from the primary mirror side
• included: tube rings and standard „small Vixen” finder mount
• dovetail: Losmandy 22 cm and Vixen 22 cm
• tube length: 50 cm
• weight: 3.6 kg